Performance diagnosis & tuning

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# 1  
Old 08-10-2009
Performance diagnosis & tuning


I am facing a strange issue. Application is deployed in a cluster with 2 Unix nodes (with same configuration). On one node the application is working fine but on another node we see this behavior I found using vmstat- when the server is not yet started everything is OK; when you start the server it is still Ok, but the moment you make the very first request the CPU usage is 90% and then it remains consistently at 90%. the moment I stop the Websphere server it CPU usage comes down back to normal.

What all can be the issue and what do I need to check to diagnose the problem

# 2  
Old 08-10-2009
What OS?
What does application logs show?
You are sure that the configuration is the same for OS and application?
# 3  
Old 08-10-2009
OS is AIX 5.
Logs show that the requests have been successfully processed and tail of the logs donot reflect any new activity.
Yes the configuration is the same on both the servers.
# 4  
Old 08-11-2009
There is a lot of different AIX 5L. AIX 5.1? 5.2? 5.3? ML/TL?

Can you post the output of
vmstat 1 10
svmon -G
vmstat -vs

of the time when it has this trouble?
Please use CODE-tags when doing so! Smilie

Is the used Java on both machines at the same level?
Are all software packages on same level (lslpp -l)?
Did you contact IBM support for Websphere yet?
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